Motivation: To a Xenon light keeps the car about 2000 hours. In my Audi TT 8J came (estimated) about the 1000 hours of light together (which is rather a lot). One might think that there is therefore still does not make sense to think about a change of bulbs ... The composition of this gas also varies with the operating time and thus can (!) To change both the color of light and the light output. That's why it makes sense in my opinion, for something 1000h (in 7 years) to replace the bulbs.
I spent hours with the choice of the burner - totally wasted life! Therefore, here in brief: I wanted an approved alternative with more blue, cold light, which is listed in a trusted dealer.
I have taken the trouble before / after to customize images and still written together some basics on my blog. Unfortunately, I can not link directly here - but the main image can be found here under "customer images". Who wants to know more (and how to before / after images makes right), would be able to find with the search terms "zero brain xenon headlights".
Ultra Short version: The change is clearly visible. The light output is higher (than the old burners) and the color of light I feel (because something cooler than the standard burners) as appropriate. See also uploaded by me "customer image" on this Birndl.
If it was "helpful" - You know.